题干
What _____ surprise! He has won the game without making great ______.
A：a; progre
B：the; effort
C：a; effort
D：the; progre
答案(点此获取答案解析）
C
对应的粒子:Mg2+；⑤氯化亚铁的化学式:FeCl2；⑥-2价的氧元素:O2-。其中正确的有（ ）